The Swiss Army Knife of processors!
This thing does it all with tons of options, and easily programable on the spot.
Having the JHV3 mod done was a popular option amongst many Nashville session guitarists at the time because of how it improved the M9's flaws.
Been working great for many years.
JHV3 Mod includes:
1. Audio Upgrade - Replace audio path components with superior HQ parts and install a new variable output (master volume for improving volume drops)
2. New Switches - Replace stock switches with HD smooth action momentary switches